println("test!") The individual tokens are: println ( "test!" )
Comments Comments are like helping texts in your Swift program. They are ignored by the compiler. Multi-line comments start with /* and terminate with the characters */ as shown below: /* My first program in Swift */ Multi-line comments can be nested in Swift. Following is a valid comment in Swift: /* My first program in Swift is Hello, World! /* Where as second program is Hello, Swift! */ Single-line comments are written using // at the beginning of the comment. // My first program in Swift
Semicolons Swift does not require you to type a semicolon (;) after each statement in your code, though itâ€™s optional; and if you use a semicolon, then the compiler does not complain about it. However, if you are using multiple statements in the same line, then it is required to use a semicolon as a delimiter, otherwise the compiler will raise a syntax error. You can write the above Hello, World! program as follows: import Cocoa /* My first program in Swift */ var myString = "Hello, World!"; println(myString)
Identifiers A Swift identifier is a name used to identify a variable, function, or any other user-defined item. An identifier starts with an alphabet A to Z or a to z or an underscore _ followed by zero or more letters, underscores, and digits (0 to 9).